Eight Photographs (Gelatine Prints) Showing X-Ray Spectra Obtained by H.G.J. Moseley, Manchester/Oxford, c.1913

These eight small format modern-style black and white gelatine prints each measuring 2½ x 3½ inches are possibly later prints from Moseley's original negatives and are outputs of experiments conducted by him, first at Manchester in 1913 and then at Oxford from November 1913 to the summer of 1914. He studied chemical samples using X-ray spectroscopy and hence determine their atomic number. The results were published in the ‘Philosophical Magazine’ in 1913 and 1914.

Moseley used X-rays to analyse the properties of elements in a new and brilliant way: he generated characteristic X-rays of sample elements and analysed them in the spectrometer. Moseley placed the specimens he wanted to investigate in an X-ray tube and created a vacuum by evacuating air from the X-ray tube and spectrometer. He made use of the effect that when an element is bombarded with energetic electrons X-rays with characteristic wavelengths are produced. These different wavelengths led to the X-rays being reflected at different angles from the crystal in the centre of the spectrometer. So when X-ray beams of different wavelengths hit a photographic plate they will create distinct lines. The angular position and separation of these lines are unique for each element. These values helped Harry to determine the wavelengths of the lines and hence the number of protons in the element’s nucleus.

Another more recent one (marked 'Copy Jan 1970') is Inv. Num. 13535 Eight Photographs (Gelatine Prints) Showing X-Ray Spectra Obtained by H. G. J. Moseley, Manchester / Oxford, c.1913

See attached narrative 'Henry 'Harry' Moseley and his experiments' for further details.